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That is not the pattern of molt. It's the pattern of broodiness. The feathers dissapear along the keel bone in prep for incubating eggs so there is direct skin contact with them to keep them warm and moist. My guess is you are probably down south of the equator where you are starting spring.

Could you please take a few more photos of closeup of that bare skin? Feather loss can be caused by a lot of things. The bare skin can give us clues. Have you lost other chickens lately to sudden death?